.\" $Id$
.\"
.\" Copyright (c) 1988-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
.\"
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.if n .po 0
.TH TIFFGT 1 "September 20, 2005" "libtiff"
.SH NAME
tiffgt \- display an image stored in a
.SM TIFF
file (Silicon Graphics version)
.SH SYNOPSIS
.B tiffgt
[
.I options
]
.I "input.tif ..."
.SH DESCRIPTION
.I tiffgt
displays one or more images stored using the
Tag Image File Format, Revision 6.0.
Each image is placed in a fixed size window that the
user must position on the display (unless configured
otherwise through X defaults).
If the display has fewer than 24 bitplanes, or if the
image does not warrant full color, then
.SM RGB
color values are mapped to the closest values that exist in
the colormap (this is done using the
.I rgbi
routine found in the graphics utility library
.BR \-lgutil .)
.PP
.I tiffgt
correctly handles files with any of the following characteristics:
.sp .5
.in +0.5i
.ta \w'\fIPhotometricInterpretation\fP  'u
.nf
\fIBitsPerSample\fP	1, 2, 4, 8, 16
\fISamplesPerPixel\fP	1, 3, 4 (the 4th sample is ignored)
\fIPhotometricInterpretation\fP	0 (min-is-white), 1 (min-is-black), 2 (RGB), 3 (palette), 6 (YCbCr)
\fIPlanarConfiguration\fP	1 (contiguous), 2 (separate)
\fIOrientation\fP	1 (top-left), 4 (bottom-left)
.fi
.in -0.5i
.sp .5
Data may be organized as strips or tiles and may be
compressed with any of the compression algorithms supported
by the 
.IR libtiff (3)
library.
.PP
For palette images (\c
.IR PhotometricInterpretation =3),
.I tiffgt
inspects the colormap values and assumes either 16-bit
or 8-bit values according to the maximum value.
That is, if no colormap entry greater than 255 is found,
.I tiffgt
assumes the colormap has only 8-bit values; otherwise
it assumes 16-bit values.
This inspection is done to handle old images written by
previous (incorrect) versions of
.IR libtiff .
.PP
.I tiffgt
can be used to display multiple images one-at-a-time.
The left mouse button switches the display to the first image in the
.I next
file in the list of files specified on the command line.
The right mouse button switches to the first image in the
.I previous
file in the list.
The middle mouse button causes the first image in the first file
specified on the command line to be displayed.
In addition the following keyboard commands are recognized:
.TP
.B b
Use a
.I PhotometricInterpretation
of MinIsBlack in displaying the current image.
.TP
.B l
Use a
.I FillOrder
of lsb-to-msb in decoding the current image.
.TP
.B m
Use a
.I FillOrder
of msb-to-lsb in decoding the current image.
.TP
.B c
Use a colormap visual to display the current image.
.TP
.B r
Use a true color (24-bit RGB) visual to display the current image.
.TP
.B w
Use a
.I PhotometricInterpretation
of MinIsWhite in displaying the current image.
.TP
.B W
Toggle (enable/disable) display of warning messages from the
.SM TIFF
library when decoding images.
.TP
.B E
Toggle (enable/disable) display of error messages from the
.SM TIFF
library when decoding images.
.TP
.B z
Reset all parameters to their default settings (\c
.IR FillOrder ,
.IR PhotometricInterpretation ,
handling of warnings and errors).
.TP
.B PageUp
Display the previous image in the current file or the last
image in the previous file.
.TP
.B PageDown
Display the next image in the current file or the first image
in the next file.
.TP
.B Home
Display the first image in the current file.
.TP
.B End
Display the last image in the current file (unimplemented).
.SH OPTIONS
.TP
.B \-c
Force image display in a colormap window.
.TP
.B \-d
Specify an image to display by directory number.
By default the first image in the file is displayed.
Directories are numbered starting at zero.
.TP
.B \-e
Enable reporting of error messages from the 
.SM TIFF
library.
By default
.I tiffgt
silently ignores images that cannot be read.
.TP
.B \-f
Force 
.I tiffgt
to run as a foreground process.
By default
.I tiffgt
will place itself in the background once it has opened the
requested image file.
.TP
.B \-l
Force the presumed bit ordering to be
.SM LSB
to
.SM MSB.
.TP
.B \-m
Force the presumed bit ordering to be
.SM MSB
to
.SM LSB.
.TP
.B \-o
Specify an image to display by directory offset.
By default the first image in the file is displayed.
Directories offsets may be specified using C-style syntax;
i.e. a leading ``0x'' for hexadecimal and a leading ``0'' for octal.
.TP
.B \-p
Override the value of the
.I PhotometricInterpretation
tag; the parameter may be one of:
.BR miniswhite ,
.BR minisblack ,
.BR rgb ,
.BR palette ,
.BR mask ,
.BR separated ,
.BR ycbcr ,
and
.BR cielab .
.TP
.B \-r
Force image display in a full color window.
.TP
.B \-s
Stop on the first read error.
By default all errors in the input data are ignored and 
.I tiffgt
does it's best to display as much of an image as possible.
.TP
.B \-w
Enable reporting of warning messages from the 
.SM TIFF
library.
By default
.I tiffgt
ignores warning messages generated when reading an image.
.TP
.B \-v
Place information in the title bar describing
what type of window (full color or colormap) is being
used, the name of the input file, and the directory
index of the image (if non-zero).
By default, the window type is not shown in the title bar.
.SH BUGS
Images wider and taller than the display are silently truncated to avoid
crashing old versions of the window manager.
.SH "SEE ALSO"
.BR tiffdump (1),
.BR tiffinfo (1),
.BR tiffcp (1),
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.simplesystems.org/libtiff/
